Characteristics of meteorology and freeze-thaw in high-latitude cold regions: a case study in Da Xing’anling, Northeast China (2022–2023)

Frontiers in Earth Science, Journal Year: 2025, Volume and Issue: 12

Published: Jan. 17, 2025

Meteorological characteristics and freeze-thaw processes are crucial indicators guiding regional economic development practical production. The Da Xing’anling Mountains, serving as a transitional zone between continuous permafrost seasonal frozen ground in northeastern China’s high latitudes, understanding the meteorological parameters patterns this region can significantly enhance accuracy of zoning maps validate climate simulation models. Based on temperature monitoring data from 2022–2023, study analyzed Jagdaqi (southern Mountains), which is located at boundary seasonally soil. results indicate: (1) At height 5 m, annual average 1.04°C. air-freezing index air-thawing −2318.95°Cd 2698.52°Cd, respectively, categorizing it severe cold region. (2) total precipitation 397.1 mm, with summer rainfall accounting for 77.4% winter only 11.3%. (3) prevailing wind direction northwest, approximately 47% frequency. Annual speeds range 0.045 to 10.33 m/s, an speed 1.51 m/s. (4) heights m 10 relative humidity 63.49% 62.1%, reaching its lowest May 44.58% 43.38%. (5) area region, maximum frost depths occurring early mid-March, ranging 1.93–1.99 classified middle-thick ground. These findings hold valuable implications ecological conservation, resource management, engineering construction, enhancing applicability models

Language: Английский

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Spatial–Temporal Characteristics of Freezing/Thawing Index and Permafrost Distribution in Heilongjiang Province, China

Sustainability, Journal Year: 2022, Volume and Issue: 14(24), P. 16899 - 16899

Published: Dec. 16, 2022

Under the trend of climate warming, high-latitude permafrost in Heilongjiang Province is becoming seriously degraded. The question how to quantitatively analyze spatial and temporal trends multi-year has become fundamental for current research. In this study, variations annual mean air temperature (MAAT), ground (MAGST) freezing/thawing index based on surface data from 34 meteorological stations 1971–2019, as well variation characteristics distribution, were analyzed freezing model. results showed that both MAAT MAGST tended decrease with increase altitude latitude. For interannual variation, warming rates be consistent across Province, −8.64 5.60 °C −6.52 7.58 °C, respectively. From (AFI) (GFI) declined at −5.07 °C·d·a−1 −5.04 °C·d·a−1, respectively, whereas thawing (ATI) (GTI) elevated 7.63 11.89 distribution multiyear AFI, ATI, GFI GTI exhibited a latitudinal trend, effect northern mountainous areas was greater than Permafrost primarily discovered Daxing’an Xiaoxing’an Mountains north, sporadically central regions. southern boundary shifted nearly 2° north 1970 2010s, while stable 51° N. total area narrowed 1.11 × 105 km2 1970s 6.53 104 2010s. study take critical significance analysis perennial degradation high latitudes whole northeastern China, mapping large using This provides reference natural cold resource development, ecological protection, change engineering construction maintenance areas.

Language: Английский

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Large-Scale Freezing and Thawing Model Experiment and Analysis of Water–Heat Coupling Processes in Agricultural Soils in Cold Regions

Water, Journal Year: 2023, Volume and Issue: 16(1), P. 19 - 19

Published: Dec. 20, 2023

Heilongjiang Province, the largest commercial grain base in China, experiences significant challenges due to environmental effects on its soil. The freezing and thawing cycle this region leads transport of water heat, as well exchange transfer energy. Consequently, exacerbates flooding disaster spring severely hampers farming activities such plowing sowing. To gain a better understanding mechanisms farmland soil cold regions prevent disasters, study focuses Province representative area northeast China. research specifically investigates frozen thawed farmland, using large-scale low-temperature laboratory simulate both artificial natural climate conditions zone. By employing similarity principle geotechnical model testing, aims efficiently engineering prototypes replicate process large-span long-time low temperatures. investigation primarily evolution laws key parameters, temperature field moisture during freeze–thaw cycle. findings demonstrate that cooling can be categorized into three stages: rapid cooling, slow stabilization. As depth increases, variability gradually diminishes. During melting stage, soil’s content exhibits gradual increase rises. range variation at depths 30 cm, 40 50 80 cm is 0.12% 0.52%, 0.47% 1.08%, 0.46% 1.96%, 0.8% 3.23%, respectively. analyze hydrothermal coupling cycle, theoretical was developed based principles mass conservation, energy Darcy’s law unsaturated flow, heat conduction theory. Mathematical transformations were applied after defining relative degree saturation solid–liquid ratio functions with respect temperature. simulated fields align measured data, indicating water–heat established holds practical value for accurately predicting sowing period, effectively utilizing resources regions.

Language: Английский

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The spatial and temporal distribution of freeze–thaw characteristics of near-surface soil in the Northeast of China and its influencing factors

CATENA, Journal Year: 2024, Volume and Issue: 249, P. 108644 - 108644

Published: Dec. 21, 2024

Language: Английский

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Spatiotemporal Differentiation and Influencing Factors of Frost Key Date in Harbin Municipality in Recent 62a

Published: Aug. 14, 2023

In this study, based on frost formation data provided by Harbin Meteorological Bureau, combined with geographical factors, temperature and population density, linear fitting, Mann-Kendall mutation test, pettitt method sliding T test were used to analyze the spatio-temporal variation characteristics of date in Municipality effects density regularity. The results showed that (1) earliest year FSD appeared was 1966 1967, 255th, i.e., August 18th, latest 283 days, October 10th, 2006. which FED April 24th 2015, 114th day year, 21st 1974, 141st year. most 2012, 161 shortest 1966, 123 days. (2) Throughout study period, increased 7.8 days at a rate -1.27d/10a, 10.9 1.77d/10a, FFS 18.9 3.05d/10a. tendency each site an increasing trend. For FED, some sites general, delayed trend, advanced prolonged Using unary regression, decreasing trend general. (3) mutated 2000, arrival time it area averaged 265th, September 22nd, after that, changed 272nd, 29th 2006, 128th, 8th. After mutation, 121st, 1st 2004. Before average 137days .But 150 days.(4) negatively correlated latitude positively temperature, while temperature. FSD, central part earliest, longest, respectively, so Pearson correlation coefficient influence longitude could not be reflected multiple regression. Several factors judged grey analysis method. is significantly related FFS.

Language: Английский

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Spatiotemporal Differentiation and Influencing Factors of Frost Key Date in Harbin Municipality from 1961 to 2022

Water, Journal Year: 2023, Volume and Issue: 15(19), P. 3513 - 3513

Published: Oct. 8, 2023

This study analyzed frost formation data provided by the Harbin Meteorological Bureau and considered geographic factors, temperature, population density. Various analytical methods, including linear fitting, Mann–Kendall mutation test, Pettitt method, sliding t-test, were employed to identify temporal spatial changes as well effects of these factors on dates in Harbin. The shows that first FSD occurred 18 August, both 1966 1967, which was 255th day. latest observed 10 October 2006, 283rd earliest occurrence an FED 24 April 2015, 114th day, 21 1974, 141st highest number days 2012, with 161 days, whereas shortest year 1966, only 123 days. Throughout period, increased 7.8 at a rate −1.27d/10a, 10.9 1.77d/10a, FFS 18.9 3.05d/10a. propensity rates each location indicate upward trend, while for FED, certain locations display trend. In general, has exhibited delayed shown earlier experienced extended With one-way regression, increasing trend site, also indicated similar showed overall decreasing change 2000, resulting average arrival time 265th or 22 September, year. Subsequently, post mutation, area 272nd 29 underwent change, being 128th 4 April, After 121st i.e., 8 April. 1 2004 saw FFS. Prior averaged 137th whilst following 150th within exhibit negative correlation latitude positive temperature. Additionally, displays As FSD, central are earliest, latest, longest, Pearson coefficient method multiple regression cannot adequately reflect effect longitude.

Language: Английский

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